WEST SULPHUR SPRINGS, West Virginia — An ousted speaker. An expelled member. A growing number of lawmakers leaving office before their term expires. The House has undergone a tumultuous year under Republican control — but GOP leaders are still confident in their chances to grow their narrow majority.

As House Republicans gathered for their annual retreat at the Greenbrier resort in West Virginia this week, party leaders outlined their strategy to unify messaging and campaign priorities as they court voters. But the party has been plagued by infighting and lingering disagreements for months, leading to criticism from their Democratic colleagues that they are unfit to lead the lower chamber.